I’ve heard a lot of people explain how having gray wolves back in the US Rocky Mountains has helped restore that ecosystem.

Since the wolves were reintroduced in Yellowstone National Park in the mid 1990s, aspen trees have rebounded and other woodland and meadow species have flourished, adding to the rich diversity of this unique area.

But the changes have been even more profound that that. As this video by wildlife chronicler George Monbiot, explains, wolves have literally brought back the land, and the rivers.

Take four minutes to watch. You’ll be amazed. And also you may better understand why biologists and conservationists have fought so hard — lately against an onslaught of bounty hunting — to keep wolves in their rightful place.

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